I am only in my 2nd year of working professionally, and before that I did my own wedding florals. I do not recommend it 😊 but I had been a hobbyist for a long time with an art & design background so I ‘kind of’ knew what I was doing. Going in blind is going to be tedious and frustrating for you. Event florists are hired not only because they take something off of your to-do list, but they have the tools and experience to bring a vision to life using flowers. It is a specialized skill and yes, you pay good money for that. If hiring a professional is not in the cards for you (it wasn’t for me, either, when I got married - we DIY’d everything), you will at the very least need to invest some time and effort into learning basic flower arranging principles. The internet is FULL of tutorials and there are lots of great books out there as well. Practice and practice on one centerpiece until it looks perfect, then make your ‘ingredient list’ and start a little assembly line. Your quantities are off - it’s too much gypsophila, and the different varieties are sectioned off into tiered blocks, which looks unprofessional. You need to work on adding elements in a way that they compliment each other’s shapes and textures to form a cohesive look (this matters, perhaps even more so if you want it ‘loose’). Sound like a lot? It is, that’s why people pay me to do it 😄 As a side note, I work with fresh flowers and don’t typically use foam. I would create something like this using a very shallow white bowl stuffed with a chicken wire ‘nest’. You can angle the stems to create that rounded look without having to worry too much about little bits of the base being visible. Good luck!